EP0930179B1 - Radiale Luftreifen für PKW - Google Patents

Radiale Luftreifen für PKW Download PDF

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Publication number
EP0930179B1
EP0930179B1 EP99300154A EP99300154A EP0930179B1 EP 0930179 B1 EP0930179 B1 EP 0930179B1 EP 99300154 A EP99300154 A EP 99300154A EP 99300154 A EP99300154 A EP 99300154A EP 0930179 B1 EP0930179 B1 EP 0930179B1
Authority
EP
European Patent Office
Prior art keywords
tire
block
corner portion
block row
central
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99300154A
Other languages
English (en)
French (fr)
Other versions
EP0930179A2 (de
EP0930179A3 (de
Inventor
Yasuo Himuro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Publication of EP0930179A2 publication Critical patent/EP0930179A2/de
Publication of EP0930179A3 publication Critical patent/EP0930179A3/de
Application granted granted Critical
Publication of EP0930179B1 publication Critical patent/EP0930179B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B60C11/1376—Three dimensional block surfaces departing from the enveloping tread contour
    • B60C11/1384—Three dimensional block surfaces departing from the enveloping tread contour with chamfered block corners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/0302—Tread patterns directional pattern, i.e. with main rolling direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/0306—Patterns comprising block rows or discontinuous ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0374—Slant grooves, i.e. having an angle of about 5 to 35 degrees to the equatorial plane

Definitions

  • This invention relates to pneumatic tires, and more particularly to a pneumatic radial tire for a passenger car having a directional tread pattern defined by a circumferential center groove continuously extending in parallel to a circumferential direction of the tire or substantially in parallel thereto, a plurality of directional slant grooves disposed at intervals in the circumferential direction of the tire and extending obliquely with respect to the circumferential direction of the tire, and a plurality of blocks formed at intervals in both circumferential and axial directions of the tire and having an acute corner portion, wherein a rotating direction of the tire upon mounting onto a vehicle is specified so as to firstly contact a portion of the directional slant groove extending toward a side of an equatorial plane of the tire with the ground and subsequently contact a portion thereof remote from the equatorial plane with the ground.
  • directional slant groove means a groove extending obliquely in the circumferential direction and forming a so-called directional tread pattern wherein the rotating direction (forward running direction) of the tire upon mounting onto a vehicle is specified so as to firstly contact a portion of such a groove extending toward a side of an equatorial plane of the tire with the ground and subsequently contact a portion thereof remote from the equatorial plane with the ground.
  • pneumatic radial tires for passenger cars are required to have a high drainage performance when running on wet road surfaces as compared with the conventionally known tires.
  • a pneumatic tire having a directional tread pattern defined by a plurality of circumferential grooves disposed at intervals in an axial direction of the tire and extending in parallel to or substantially in parallel to the circumferential direction of the tire, a plurality of directional slant grooves disposed at intervals in the circumferential direction of the tire and extending obliquely in the circumferential direction of the tire to open to the circumferential grooves, and a plurality of blocks formed at intervals in both circumferential and axial directions of the tire, and specifying the rotating direction of the tire upon mounting onto a vehicle so as to firstly contact a portion of such a groove extending toward a side of an equatorial plane of the tire with the ground and subsequently contact a portion thereof remote from the equatorial plane with the ground.
  • the circumferential grooves are used for drainage in front and rear directions and the slant grooves are used
  • an object of the present invention to solve the aforementioned problems of the conventional technique and to provide a pneumatic radial tire for a passenger car having an improved drainage performance when running on a wet road surface by preventing or controlling the occurrence of water flow disorder or bubbles without degrading the steering stability when running on a dry road surface.
  • a pneumatic radial tire for a passenger car having a directional tread pattern defined by a circumferential center groove continuously extending in parallel to a circumferential direction of the tire or substantially in parallel thereto, a plurality of directional slant grooves disposed at intervals in the circumferential direction of the tire and extending obliquely with respect to the circumferential direction of the tire, and a plurality of blocks formed at intervals in both circumferential and axial directions of the tire and each having an acute comer portion, wherein a rotating direction of the tire upon mounting onto a vehicle is specified so as to firstly contact a portion of the directional slant groove extending toward a side of an equatorial plane of the tire with the ground and subsequently contact a portion thereof remote from the equatorial plane with one ground, in which (1) the blocks form a pair of central block rows arranged on both sides of the equatorial plane in a central zone of the tread and a pair of side block rows
  • the acute corner portion of the block has an angle of 10-60°, and the surface of the corner portion of the block is chamfered from the tip thereof in the longitudinal direction of the block over a distance at least longer than the depth of the directional slant groove.
  • a surface of an acute corner portion of a block constituting the central block row located inward in the axial direction of the tire is chamfered so as to gradually shallow from a tip of the corner portion toward a width-widening part thereof.
  • the central block row is arranged on a circumference at a block density corresponding to a half of that of the side block row, and the side block row is constructed by alternately arranging a block connected to each block of the central block row and an independent block not connected to the block of the central block row.
  • the pneumatic radial tire according to the invention has the above-mentioned structure, and particularly has a structure that the acute corner portion of the block constituting the central block row located outward in the axial direction of the tire and the acute corner portion of the block constituting the side block row located inward in the axial direction of the tire stand face to face and are connected to each other at their chamfered tips, so that water flowing along stepping-in side edges and kicking-out side edges of the blocks constituting the central block row can flow along stepping-in side edges and kicking-out side edges of the blocks constituting the side block row in approximately equal amounts without disorder at the junctions between the stepping-in sides and the kicking-out sides to smoothly discharge from an opening end of the tread.
  • a false dividing groove is formed between the central block row and the side block row by chamfering the surface of the acute corner portions of the blocks consituting the central block row located outward in the axial direction and the surface of the acute corner portions of the blocks constituting the side block row located inward in the axial direction so as to gradually shallow from the tip of the corner portion toward the width-widening part thereof and to make the chamfering depth of the tip shallower than the depth of the directional slant groove and then connecting the acute corner portions of the blocks constituting the central block row located outward in the axial direction to the acute corner portions of the blocks constituting the side block row located inward in the axial direction of the tire at their chamfered shallowest tips.
  • Such a false dividing groove forms a guide line for the water flow in the groove bottom portion, so that the water flowing along the stepping-in side edges and kicking-out side edges of the blocks constituting the central block row can flow along the stepping-in side edges and kicking-out side edges of the blocks constituting the side block row before water is excessively mixed at the false dividing groove to attain the effect of controlling the disorder of the water flow.
  • the acute corner portion of a block has an angle of 10-60°.
  • the angle of the acute corner portion exceeds 60°, there is lost an effect of mitigating resistance of a water film upon stepping into a wet road surface, while when it is less than 10°, the block rigidity considerably lowers.
  • the block rigidity is particularly important because a large lateral input is applied to the acute corner portion located at the outside of the tread when cornering. Therefore, it is preferable to make the angle of the acute corner portion as larger as possible.
  • the surface of the acute corner portion of the block is preferably chamfered from the tip thereof in the longitudinal direction of the block over a distance at least longer than the depth of the directional slant groove.
  • Fig. 1 a partly enlarged plan view of a tread pattern in the pneumatic radial tire according to the invention.
  • This tire has a tire size of 205/50R16 and a tread width TW of 170 mm.
  • the tire according to the invention comprises a circumferential center groove 1 continuously extending in parallel to a circumferential direction of the tire, a plurality of directional slant grooves 2 arranged at intervals in the circumferential direction of the tire and extending obliquely with respect to the circumferential direction of the tire, and a plurality of blocks 31, 32 formed at intervals in both circumferential and axial directions of the tire and each having an acute corner portion, and has a directional tread pattern specifying a rotating direction RD of the tire upon mounting onto a vehicle so as to firstly contact a portion of the directional slant groove 2 extending toward a side of an equatorial plane EP of the tire with the ground and subsequently contact a portion thereof remote from the equatorial plane EP with the ground.
  • the blocks 31 form a pair of central block rows B 1 arranged on both sides of the equatorial plane EP in a central zone of the tread, while the blocks 32 form a pair of side block rows B2 arranged outside of each of the central block rows B1 in the axial direction of the tire.
  • An acute corner portion 31b having an angle of 15° is formed in the block 31 outward in the axial direction of the tire, while an acute corner portion 32a having an angle of 25° is formed in the block 32 inward in the axial direction of the tire.
  • the surface of the acute corner portion 31b of the block 31 constituting the central block row B1 located outward in the axial direction of the tire and the surface of the acute corner portion 32a of the block 32 constituting the side block row B2 located inward in the axial direction of the tire are chamfered so as to gradually shallow from their tips toward a width-widening part.
  • a chamfering depth d in the tip is 5 mm and a groove depth D of the directional slant groove 2 is 8 mm, so that the chamfering depth d of the tip is made shallower than the groove depth D of the directional slant groove 2.
  • the acute corner portion 31b of the block 31 constituting the central block row B1 located outward in the axial direction is connected to the acute corner portion 32a of the block 32 constituting the side block row B2 located inward in the axial direction at their shallowest tip parts formed by chamfering, whereby a false dividing groove 4 is formed between the central block row B1 and the side block row B2.
  • the surface of the comer portion 31a of the block 31 constituting the central block row B1 located inward in the axial direction of the tire is chamfered so as to gradually shallow from its tip toward the width-widening part likewise the case of chamfering the surface of the corner portion 31b.
  • the blocks 31 are arranged at a block density corresponding to a half of the block density in the side block row B2, so that the side block row B2 is constructed by alternately arranging a block 32 connected to each block 31 of the central block row B1 and an independent block 32 not connected to a block 31 of the central block row B1.
  • Fig. 3 is shown a partly enlarged plan view of a tread pattern in the conventional tire.
  • This tread pattern of the conventional tire is defined by five circumferential grooves extending straight in the circumferential direction and a plurality of slant grooves extending obliquely with respect to the circumferential direction to form a plurality of blocks at intervals in both circumferential and axial directions of the tire.
  • Tests for evaluating the resistance to hydroplaning when straight running and cornering on a wet road surface and the steering stability when running on a dry road surface are carried out with respect to the example tire according to the invention and the conventional tire.
  • the resistance to hydroplaning when straight running on a wet road surface is evaluated by a driver's feeling of a hydroplaning limit speed when straight running on a road surface having a water depth of 5 mm.
  • the resistance to hydroplaning when cornering is evaluated by measuring lateral gravity of a hydroplaning limit when the vehicle is turned on a road surface having a water depth of 5 mm at a radius of 80 m.
  • the steering stability on dry road surface is evaluated by a driver's feeling when the tire is run on a circuit course of dry state at various sporty modes.
  • the invention provides a pneumatic radial tire for passenger car having improved drainage performance on a wet road surface without lowering the steering stability on a dry road surface.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Claims (5)

  1. Radialer Luftreifen für einen Personenwagen, mit einem gerichteten Laufflächenmuster, das definiert ist durch eine mittlere Umfangsrille (1), die sich parallel, oder im wesentlichen parallel, zu der Umfangsrichtung des Reifens kontinuierlich erstreckt, eine Vielzahl von gerichteten, schrägen Rillen (2), die in der Umfangsrichtung des Reifens in Abständen angeordnet sind und sich schräg zu der Umfangsrichtung des Reifens erstrecken, und eine Vielzahl von Blöcken (31, 32), die sowohl in der Umfangsrichtung, als auch der axialen Richtung des Reifens in Abständen gebildet sind, und von denen jeder einer spitzwinkligen Eckbereich hat, wobei eine Rotationsrichtung (RD) des Reifens beim Anbringen an einem Fahrzeug so spezifiziert ist, daß ein Bereich der gerichteten, schrägen Rille (2), der sich zu einer Seite der Äquatorebene (EP) des Reifens hin erstreckt, den Boden zuerst berührt, und ein Bereich dieser Rille, der fern von der Äquatorebene gelegen ist, den Boden danach berührt, wobei die Blöcke (31, 32) zwei zentrale Blockreihen (B1) bilden, die auf den beiden Seiten der Äquatorebene (EP) in einer zentralen Zone der Lauffläche angeordnet sind, und zwei seitliche Blockreihen (B2) bilden, die in der axialen Richtung des Reifens außerhalb von jeder der zentralen Blockreihen (B1) angeordnet sind, dadurch gekennzeichnet, daß:
    (i) eine Oberfläche eines spitzwinkligen Eckbereichs (31b) eines die zentrale Blockreihe (B1) bildenden Blocks (31), der in der axialen Richtung des Reifens außerhalb gelegen ist, und eine Oberfläche eines spitzwinkligen Eckbereichs (32a) eines die seitliche Blockreihe (B2) bildenden Blocks (32), der in der axialen Richtung des Reifens innerhalb gelegen ist, so abgeschrägt sind, daß sie von der Spitze des Eckbereichs zu einem breiter werdenden Teil des Eckbereichs hin allmählich flacher werden, und die Abschrägungstiefe (d) der Spitze kleiner ist als die Tiefe (D) der gerichteten, schrägen Rille (2); und
    (ii) ein spitzwinkliger Eckbereich (31b) eines die zentrale Blockreihe (B1) bildenden Blocks (31), der in der axialen Richtung des Reifens außerhalb gelegen ist, und ein spitzwinkliger Eckbereich (32a) eines die seitliche Blockreihe (B2) bildenden Blocks (32), der in der axialen Richtung des Reifens innerhalb gelegen ist, bei ihren abgeschrägten flachsten Spitzen miteinander verbunden sind, um eine falsche Teilungsrille (4) zwischen der zentralen Blockreihe (B1) und der seitlichen Blockreihe (B2) zu bilden.
  2. Radialer Luftreifen wie in Anspruch 1 beansprucht, dadurch gekennzeichnet, daß der spitzwinklige Eckbereich (31b, 32a) des Blocks (31, 32) einen Winkel von 10-60° hat.
  3. Radialer Luftreifen wie in Anspruch 1 oder 2 beansprucht, dadurch gekennzeichnet, daß die Oberfläche des Eckbereichs (31b, 32a) des Blocks (31, 32) von der Spitze in der Längsrichtung des Blocks über eine Entfernung abgeschrägt ist, die mindestens größer als die Tiefe (D) der gerichteten, schrägen Rille (2) ist.
  4. Radialer Luftreifen wie in irgendeinem der Ansprüche 1 bis 3 beansprucht, dadurch gekennzeichnet, daß die Oberfläche eines spitzwinkligen Eckbereichs (31a) eines die zentrale Blockreihe (B1) bildenden Blocks (31), der in der axialen Richtung des Reifens innerhalb gelegen ist, so abgeschrägt ist, daß er von der Spitze des Eckbereichs zu einem breiter werdenden Teil des Eckbereichs hin allmählich flach wird.
  5. Radialer Luftreifen wie in irgendeinem der Ansprüche 1 bis 4 beansprucht, dadurch gekennzeichnet, daß die zentrale Blockreihe (B1) auf dem Umfang mit einer Blockdichte angeordnet ist, die der Hälfte der Blockdichte der seitlichen Blockreihe (B2) entspricht, und die seitliche Blockreihe (B2) gebaut ist durch abwechselnde Anordnung eines Blocks (32), der mit einem Block (31) der zentralen Blockreihe (B1) verbunden ist, und eines unabhängigen Blocks (32), der nicht mit einem Block (31) der zentralen Blockreihe (B1) verbunden ist.
EP99300154A 1998-01-14 1999-01-11 Radiale Luftreifen für PKW Expired - Lifetime EP0930179B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP00600198A JP3958426B2 (ja) 1998-01-14 1998-01-14 方向性傾斜溝を備えた乗用車用空気入りラジアル・タイヤ
JP600198 1998-01-14

Publications (3)

Publication Number Publication Date
EP0930179A2 EP0930179A2 (de) 1999-07-21
EP0930179A3 EP0930179A3 (de) 2000-07-05
EP0930179B1 true EP0930179B1 (de) 2003-04-02

Family

ID=11626529

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99300154A Expired - Lifetime EP0930179B1 (de) 1998-01-14 1999-01-11 Radiale Luftreifen für PKW

Country Status (5)

Country Link
US (1) US6123129A (de)
EP (1) EP0930179B1 (de)
JP (1) JP3958426B2 (de)
DE (1) DE69906396T2 (de)
ES (1) ES2195512T3 (de)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4559638B2 (ja) * 1999-02-26 2010-10-13 株式会社ブリヂストン 空気入りタイヤ
JP4275283B2 (ja) * 2000-02-16 2009-06-10 株式会社ブリヂストン 空気入りタイヤ
US6520230B1 (en) * 2000-09-06 2003-02-18 The Goodyear Tire & Rubber Company Tire with an open tread
US6983777B2 (en) * 2002-10-15 2006-01-10 The Goodyear Tire & Rubber Company Tire tread with multi-planar chamfers
US7028733B2 (en) * 2003-06-23 2006-04-18 The Goodyear Tire & Rubber Company Pneumatic tire having circumferentially extending rib with chamfers
US7143798B2 (en) * 2003-06-23 2006-12-05 The Goodyear Tire & Rubber Company Pneumatic tire having tread with axially adjacent block chamfer and rib chamfer
US6968881B2 (en) * 2003-06-23 2005-11-29 The Goodyear Tire & Rubber Company Pneumatic tire including steeply slanted grooves, rib having sipes and blocks having sipes
DE50310704D1 (de) * 2003-08-09 2008-12-11 Continental Ag Laufflächenprofil eines Fahrzeugluftreifens
JP2005153654A (ja) * 2003-11-25 2005-06-16 Bridgestone Corp 空気入りタイヤ
EP1637355B1 (de) * 2004-09-17 2007-05-30 Bridgestone Corporation Luftreifen
KR100748205B1 (ko) 2006-11-16 2007-08-09 한국타이어 주식회사 차량용 공기입 타이어
USD606482S1 (en) 2009-05-14 2009-12-22 Bridgestone Americas Tire Operations, Llc Tire tread
USD643805S1 (en) 2010-03-12 2011-08-23 Bridgestone Americas Tire Operations, Llc Tire tread
USD657733S1 (en) 2010-08-23 2012-04-17 Bridgestone Americas Tire Operations, Llc Tire tread
JP5802504B2 (ja) * 2011-09-28 2015-10-28 株式会社ブリヂストン 空気入りタイヤ
ES2796300T3 (es) 2014-11-27 2020-11-26 Gravi Float As Terminal de lecho marino para actividades en alta mar
JP7225871B2 (ja) * 2019-02-06 2023-02-21 住友ゴム工業株式会社 タイヤ
JP7372550B2 (ja) * 2020-04-14 2023-11-01 横浜ゴム株式会社 タイヤ

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US580070A (en) * 1897-04-06 welch
US4690189A (en) * 1986-01-29 1987-09-01 The Goodyear Tire & Rubber Company All-season pneumatic tire with chamfered tread blocks
JPH02270609A (ja) * 1989-04-13 1990-11-05 Yokohama Rubber Co Ltd:The 空気入タイヤ
FR2669273A1 (fr) * 1990-11-15 1992-05-22 Michelin & Cie Bande de roulement d'enveloppe de pneumatique pour vehicules poids-lourds.
US5327952A (en) * 1991-03-08 1994-07-12 The Goodyear Tire & Rubber Company Pneumatic tire having improved wet traction
JP3193452B2 (ja) * 1992-05-25 2001-07-30 株式会社ブリヂストン 空気入りタイヤ
JP3388902B2 (ja) * 1994-09-20 2003-03-24 株式会社ブリヂストン 空気入りラジアルタイヤ
JPH08104109A (ja) * 1994-10-06 1996-04-23 Bridgestone Corp 空気入りタイヤ
JP3555777B2 (ja) * 1994-11-22 2004-08-18 株式会社ブリヂストン 方向性傾斜溝を有する高運動性能空気入りタイヤ
JP3542687B2 (ja) * 1996-06-11 2004-07-14 株式会社ブリヂストン 空気入りタイヤ
US6213180B1 (en) * 1997-03-26 2001-04-10 Bridgestone Corporation Pneumatic radial tire including beveled acute angle corner portions

Also Published As

Publication number Publication date
EP0930179A2 (de) 1999-07-21
US6123129A (en) 2000-09-26
DE69906396T2 (de) 2004-02-05
ES2195512T3 (es) 2003-12-01
JPH11198611A (ja) 1999-07-27
JP3958426B2 (ja) 2007-08-15
DE69906396D1 (de) 2003-05-08
EP0930179A3 (de) 2000-07-05

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